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Siang dan malam terjadi karena rotasi Bumi pada porosnya. Rotasi Bumi adalah perputaran Bumi yang terjadi setiap 24 jam sekali.  Penjelasan Bumi berputar pada porosnya yang miring sekitar 23,5 derajat.  Saat bagian Bumi yang kita huni menghadap Matahari, maka kita mengalami siang hari.  Saat Bumi terus berputar, kita bergerak ke sisi yang membelakangi Matahari, maka kita mengalami malam hari.  Rotasi Bumi menyebabkan sebagian permukaan Bumi mendapatkan cahaya Matahari, sementara sisi lainnya te...
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